I know this thread is old, but I recently purchased and installed the Twin Busch S3-10E and thought I would throw my 2 cents in...
I researched the hell out of this thing before buying, so there wasn't anything that came up as a surprise, which was a good thing. Dan at Twin Busch is very responsive, and answered all of the questions I had prior to and after purchasing. A VERY big reason I wound up buying this lift versus other mid/low rise lifts is that this lift does not need air. The almost identical Atlas Qwik Bay 7000 needs compressed air to release the safety locks (so you can lower the lift after raising). Also, the moving parts of this style of scissor lift do not roll on the concrete - I briefly considered the Bendpak MD6XP-style of lift, but I didn't like that the wheels rolled directly on the concrete. I just don't want to risk wearing, crumbling concrete in my garage in the future.
I am going to buy the Atlas Scissor Lift Support Bars to use with this lift, as the frame of my truck is too close to the inside edges of the lifting platforms for my liking. This set will balance out the load across the entire width of the platform, and is a necessary accessory IMO if you're going to be lifting any vehicles where the lifting points don't fall exactly in the middle of the platforms. Dan at Twin Busch told me that they are developing Twin Busch-branded support bars, but doesn't know when they will be released for sale.
Something else I noticed is that the packaging the lift came in indicates a max load of 7000 lbs instead of the advertised 6600, so that was nice. Also, I realized that if you put a sheet of plywood over the lifting platforms, you now have a hydraulic lifting table - I wish I would have had this thing when I bought my 44" tool box a few months ago!
To the previous poster @byalegend - the manual states that the lift pulls 16 amps, so Twin Busch recommends a dedicated 20 amp circuit, not 30 amp - I installed a dedicated 20 amp run to my box, and have lifted my vehicle numerous times without issue. Not sure if you've already made a decision, as this thread is over two years old.
I'd be happy to answer any other questions for anyone considering this lift, as there doesn't seem to be much information out there on it. I would absolutely buy this lift again now that I've got some experience with it.